一台奥迪100四缸轿车出现了发动机工作不稳,怠速不良故障。人工检查时,油电路没发现异常。月检测仪进行怠速及点火时间检查时,发现怠速转速和点火提前角都不符合要求;因此对怠速及点火提前角进行调整,刚调好时,发动机怠速运转较稳,但当运转一会儿或踩几下油门踏板后,发动机上述故障再现。并且从检测仪上可以看出,怠速时点火提 An Audi 100 four-cylinder sedan engine instability, poor idle failure. Manual inspection, the oil circuit found no abnormalities. When the idle speed and ignition timing were checked, the idle speed and ignition advance angle were found to be unsatisfactory. Therefore, the idle speed and ignition advance angle were adjusted. When the engine speed was just adjusted, the engine idling steadily, but when running for a while or on the tread, After a few accelerator pedal, the above engine fault reproduction. And can be seen from the detector, ignition at idle idle